// Object 是原型链的顶端，可以是所有类型
let a0:Object = '1'
let a1:Object = ()=>{}
let a2:Object = {}
let a3:Object = []
let a4:Object =  1      //null和undefined不可以

// object  非原始类型，支持所有引用类型
let b1:object = {}
let b2:object = []
let b3:object = ()=>{}

// {} 理解为 new Object,支持所有
let c:{} =1
